The kangaroo package

Binary parsing with random access. The target file to be
parsed is loaded into memory at the start (represented as
an IOUArray Int Word8). Parsing proceeds by moving a cursor
around, the array is left intact. This allows _jumping_
inside the file and contrasts with other parser
combinators that progress via consuming input.

* Caveat * - the above of course means that the target file
is obliged to be small enough to fit into memory.

** MAJOR CAVEAT ** - kangaroo is somewhat half-baked at the
moment - the parsing machinery seems good but the combinators
and primitive parsers need more work. I've only released it on
Hackage because I'm now using it with Hurdle which was already
on Hackage.

Currently kangaroo is twinned with its own library of formatting
combinators, at some point this is likely to be put into its
own package